My plywood board almost ready for the water now, i did use 4 + 7 mm plywood (fir) polyester between and 24h in the rockertable. Cut out the shape, drilled holes for the tnuts under the board and filled the holes with polyester. Now its time for painting, i will use a 2part epoxy paint (primer for boats under and over water surface) only primer becaus i think its looks nice when the finish isent so shiny..

My question, i have sanded the board, but the plywood is not smooth enough to paint on (it will look crapy)

What should i use to get a nice even smooth surface, before painting the board..